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Question: 

Calculate the wavelength of the He–Ne laser (see Fig. 28–20).

Energy levels for He and Ne. He is excited in the electric discharge to the E_1 state. This energy is transferred to the E'_3 level of the Ne by collision. E'_3 is metastable and decays to E'_2 by stimulated emission.

Figure 28-20 Energy levels for He and Ne. He is excited in the electric discharge to the $E_1$ state. This energy is transferred to the $E'_3$ level of the Ne by collision. $E'_3$ is metastable and decays to $E'_2$ by stimulated emission.

Giancoli, Douglas C., Physics: Principles with Applications, 7th Ed., ©2014. Reprinted by permission of Pearson Education Inc., New York.
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Quick Answer: 

$634 \textrm{ nm}$

Giancoli 7th Edition, Chapter 28, Problem 43

(0:55)

Chapter 28, Problem 43 is solved.

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